I'm with you in having a great preference for sucking over being sucked. But, even just having been sucked by a handful of guys, I can tell part of it is skill level. I believe there a lot of mediocre suckers out there, and this is in part because, at least for most guys, if most of what you do is hookup without much repeating of partners, there isn't a lot of room for feedback and learning. My experience is actually that the men who were more inclined to monogamy or polyamory rather than just promiscuity were more pleasurable receiving from. So yes, even for me where it's not my thing, it can be fairly pleasurable if the guy knows what he's doing. Otherwise it's more like "ah, do we have to? Can't we just stick to me sucking you?"